Burglarproof induction coil



- 1,576,779 H. J. MURRAY BURGLARPROOF' INDUCTION COIL Filed Oct. 11, 1921 March 16 192s.

INVENTOR 5, 5, I Howawd/ Illa/ray T BY ATTORNEY I Patented Mar. 6, 1926.

4 UNITED STATES,-

BURGLARPBOOI' INDUCTION COIL.

Application filed October 11, 1921. Serial 80. 507,011.

.To all whom it may concern: Be it known that I, HOWARD J. MURRAY, a citizen of the United States, and resident of New Yorklcity, in the county of Kings and 5 State of .New York, have invented certain new and useful Improvements in=Burglarproof Induction Coils, of which the following is a specification. a

The invention relates in general to an induction coil, and specifically relates to a unit constituting an article of 'manufacture' closure at one end and'with a circuit closer positioned in the casing and between the closed end thereof and the coil. Any casing and closure therefor designed to defeat burglarious attempts to gain access to the interior is expensive, audit is of 'course a commercial requirement of such devices to economize in cost of construct-ion. Howthe prior device which encloses the coil would act to decrease its burglar resisting functions and would even permit the bodily removal of the coil or at least permit-access to the circuit closer or to the coil terminals leading to the protected circuit closerZ Accordingly, one of the objects of the invention is to retain the advantages inherent in the prior disclosure in that the induction coil and its associated control mechanism can be set by authorized means and which will tend to defeat attempts to change the status of the coil-whenso set, and at the same time by the improved device herein disclosed to attain these results with the use P ever, it is appreciated that any reductionofi:

or elimination of, the part of the casing in PATENT OFFICE.

HOWARD J. MURRAY, OF NEW YORK, N. Y.

of a smaller amountv of burglar resisting material than is necessary ,wlth the prior' device.

Incidental to this desideratum, the invention contemplates the inclusion of a bur lar proof means for securing the coil to the urglar proof casing in such a way that access to the securing means is provided only through the casing and "any attempt togain access to the fastening means through the coil will destroy the same. i

y In other words it is the intent 'of the present disclosure to. retain the advantages inherent in a coil which is exposed in the sense ofnot being contained within a magnetic circuit" forming enclosure, but which, at'the same time, is so associated with its burglar resisting features as will cause the coil to become functionally inoperative, and even mutilated by any surreptitious attempt to gain access tothe control mechanism or to remove the coil from the burglar resisting parts of the complete unit.

In one form of the invention herein selected for illustration it is assumed that the device constitutes part-of the ignition system in an automotive power plant, and when so used. it is intendedthat the. control mechanism be key-controlled in order to set the coil in an inoperative position to prevent actuation of the power plant. When so used the device will resist unauthorized attem ts to cause the ignition circuit to function lay closing the open circuit across the secondary winding terminals, to restore the operativeness of the coil.

fnussuEn v Accordingly, another object of the inven- 7 tion when considered in this specific application of one way of using the invention is to provide a simple, inexpensive coil which can be sold as an automotive acces so to take the place of the present coil and which will include a protector for preventing the use of the coil in a circuit which is set so as to be inactive. The invention features small size 'means for protecting the controlling switch of the circuit closer, for preventing the intact demounting of the coil when locked in place, for retarding attempts to restore the coil .when apt to be inactive back into an operative condition and in general to prevent or at least retard unauthorized is attempts to change the status of the coil or the circuit which contains the coil.

Various other objects and advantages of the invention will be in part obvious from an inspection. of the accompanying drawings and in part will he more fully. set forth in the following particular description of one form of mechanism embodying my invention, and the invention also consists in certain 'new and novel features of construction and combination of parts hereinafter set permit.

side of the device.

forth and claimed.

'In the accompanying drawings Figure 1 is a vertical sectional view taken axially through, a perferred embodiment of the invention Figure 2 is a transverse sectional view taken on the line 2--2 of Figure 1 looking .in the direction indicated by the arrows;

and

F igure 3 is a fragmentary view similar to the showing atthe left hand side of Figure 1 and slightly modified to accommodate mechanism in the casing in'addition to the mechanism shown in Figure 1.

' In the following description and in the.

claims, parts will be identified by specific names for convenience of expression but they are intended to be as generic in their application to similar parts aS the art Wlll In the drawin s there is shown a casing 10, secured fixed y in position in a mounting plate 11 and which mounting plate may be the instrument board of the vehicleor any other suitable support. The casing is of cylindrical form, opened at oppos te ends and is provided centrally thereof with an integral barrier 12 which divides the casing into a rear, coil-containing chamber 13, and into a front, mechanism containing chamber 14. The casing including the barrier is of steel, has a case-hardened outer surface and a relatively soft inner surface. Thecasing is designed to resist filing, (llllling, chisellin or shattering, as is more fully describe in the above identified application.

The front end of the casing is closed by means of a cylindrical locking-cap 15, the outer wall 16 of which is case-hardened as previously described for the casing so as to retard if not to defeat unauthorized entrance-into the chamber 14 through the front Relative rotary movementv between the ca and the casing is revented and the loc ing elements located y means 6f locating pins 17 which extend from the free edge of the cylindrical flange 18 of the cap into suitably disposed recesses 19 formed 1n the barrier 12 adjacent its perimeter.' The cap is locked to the casing by means of a lockingca'm 20 fixed to the rear end of the barrel 21 of a lock 22 which 'e-nclo:es the head 33 of the core bolt.

controlled by means of a key 23 actuated from the exterior of the device as is usual in such structures.

The cam is. of an eccentric type and is designed to be rotated by the key into a locking position and in this'position extends through a slot 24 in the flange 18 and is fitted into an arcuate recess 25 formed on the inner side of the casing.

An induction coil 26 of the usual cylin drical form has one end thereof fitted within the chamber 13 and has its major portion projecting exteriorly of the flange which forms the portion of the casing 10 to the rear of the barrier 12. It is a feature of this disclosure that the coil is largely exposed, that is, as much of the coil as .1s possible is disposed to the outside of the metallic casing. In this Way the electrical metallic casing as little as possible.

Except for the core bolt 26 the coil is substantially of conventional form and includes a bundle of core wires'27 encircled by primary windings 28 which in turn are encircled by secondary windings 29. The structure is enclosed within an insulating filler shell 30 which in turn is encircled by an outer fibrous covering shell 31. The outer end of the shell 31 encircles an end filler 32 at the exposed end of the core. The filler 32 is of some material thickness 212d I] end cap 34 finishes off the outer end of the col Primary leads 35 and 36 extend through the exposed end of the coil and lead respectively toan'd from the prima-r windings. It is u'nderstood'that the lea s 35, 36 are part of the circuit which includes the primary winding of the coil, a source of electric energy and othei' instruments usual'in such circuits. A secondary lead 37 from the secondary windings extends through an insulating bushing 38 in the.

side of the coil, and is intended to lead to the spark plug or other usual instruments in the secondary circuit, as is usual in well known coil constructions.

A distinctive feature of the core bolt is that it is made of carbonized steel, or simi Y 9 from each other by a bracket 48. The concore bolt inv position when the nut is in bearing engagement with the side of the barrier 12. A nut 42 engages the opposite side of the barrier and is disposed between the barrier and the coil, and in this. Way constitutes a shoulder for limiting the movement of the bolt towardsthe barrier. Tightenin up on the nut 41 secures the bolt fixe ly in position and the square fit of the bolt in the barrier prevents turningof the bolt about its'axis. It is a featureof this disclosure that access to the bolt locking means can be attained only from the open end of the casing and in this way the locking means provided by the nut 41 is pro- .tected by the burglar proof casing when the locking cap is in its locked position.

A circuit. closer 42' for controlling the coil is positioned within .the protected compartment 14 and is preferably controlled by the rotation of the locking cam so that the one key can be used both to lock the closure and control the coil. The cam is provided with one or morecontact buttons, herein shown to be three, 43, 44, 45 fitted to extend through the locking cam. Opposite ends of each button are adapted when rotated into I proper position. to be engaged by spring contacts 46 and 47 carried by and insulated tacts are connected respectively to leads 49 and 50 extending through bushings 51 in the barrier 12. These leads constitute part of the electric circuit which includes the primary windings and source of energy. Where more than one of the contact buttons is carried by the cam it is intended that the cam control other circuits than the primary winding circuit thus described. 1 For this purpose there is shown in Figure 3 additional conductors 52 and 53 which extend {straight through the body of the coil. from end to end and through thebushings 51 in the barrien. These extra conductors may be connected to the circuit closer illustrated in Figure 1 and may be operatively connected to other circuit affecting instrumentalities. For instance, the conductors 52 and 53 might be included in a signal or head light circuit which could be controlled by the" manipulation of the key 23 in any desired preset relation to the closing or'opening of the circuit through the primary wind- 1n Y imilarly it is to be understood that the closing or opening of the circuit including the primary windings may be. controlled by other instrumentalities than the manually actuated locking cain featured in Figure 1 and to show, one such form of structure, there is shown in Figure 3 ayslightly larger chamber 14 than the chamber illustrated in Figure'l. In Figure 3 the chamber 14 contains a unit or casing 54 which may be considered ascontaining a pendulum controlled circuit closer of the ty e disclosed in my copending application, erial No. 436,803, entitled Multiplex burglar alarm, filed January 12th, 1921. p

Instead of leading the wires 52, 53 through the body of the coil, the bolt may be tubular and contain a bore 55 through which extends a cable 56 containing the wires 52, 53 and if desired one or both of the primary circuit leads 35, 36 or even the secondary lead 37 may also extend through the bolt directly into the chamber 14.

In operation it is to be understood that the coil functions as is usual in such devices and that by the simple manipulation of the key the cap may be locked in position and the circuit closer and other instruments controlled. by the key arelocked in either an opened or closed circuit position. Assuming that the coil forms part of an ignition circuit when the operator desires to leave the car he will turn" the locking cam into such position as will lock the closure to the casingand lock the circuit in opened position.

When so set it is apparent that access to the circuitcloser, or to the leads connected thereto, is retarded, if not prevented by the burglar proof casing. This leaves access to the leads only through the coil, but it is obvious that any attempt to gain access to the leads 49 and 50 through the coil would destroy the operativeness of the same. When so destroyed or even mutilated it could not be used even if the burglarshould succeed in closing the primary circuit by electrically connecting the Wires'49 and 50. As the coil is secured to the casing by means of the bolt it is seen that any attempt to gain access to this bolt. which is in the interior. of the coil, would likewise result in the mutilation of the coil and its effectiveness would thus be destroyed. hen used as part of the igni- -t-ion. system it will be understood that when condition of the circuit which includes the primary windings has preset by the rotation .tioncoil having one end fitted in said coil receiving compartment and projecting therefrom, said coil including a core bolt with one end secured to said barrier, means accessible through the'open end of thecircuit closer containing compartment f,or locking the bolt in place, said barrier provided with an opening extending therethro'ugh, a circuit closer disposed within the circuit closer containing compartment for controlling the coil, a conductor leading from the primary windings of the coil through said opening to the circuit closer and a burglar proof closure for the open end of the circuit closer containing compartment.

2. In an induction coil unit, the combination of a metallic casing open at opposite ends and having a barrier integral there with and dividing the casing into a circuit closer containing compartment and into a coil receiving compartment, an induction coil with one end fitted in said second named compartment and with the major portion of the coilprojecting from the casing, a circuit closer in said first named compartment operatively connected to the coil through said meta barrier, a closure for the first named, compartment and metallic fastening means for securing the coil in locked position to the metal barrier.

3. In an induction coil unit, the combination of a metallic casing open at opposite ends and having a barrier integral therewith and dividing the easing into a circuit closer containing compartment and into a coil receiving. compartment, an induction coil with one end fitted in said second named compartment and with the major ortion of the coil projecting from the easmg, a circuit closer in said first named compartment operatively connected to the coil through said metal barrier and a closure for the first named compartment.

4. An induction coil unit. including a metallic end wall, a core bolt secured to said wall, extending therefrom in one direction and coactingtherewith to form part of the magnetic circuit of the coil, a circuit closer on the side 'of the wall opposite the extend-ing bolt and operatively connected through the wall to control the circuit through the primary windings of the coil and burglar proof means enclosing the circuit closer for securing the same against unauthorized attempts to change the status of the coil as set by the circuit closer.

5. An induction coil provided with a mounting end, a burglar proof casing for receiving said end permitting the remainder of the coil to project from the casing, a core bolt positioned in the coil and projectin beyond the outlines of the mounting en and into said casing, the projectin portion of the bolt provided with means or secur' coil to the casing and a conductor leadin from one of the coil windings throng said. mounting end adjacent the projecting portion ofthe'bolt.

6. An induction coil unit including an end wall, with the coil windings on one side thereof, a core bolt extending ing the windings and end wall, locklng means on ings for securing the through the the side of the wall 0 posite the coil windolt to the wall and a burglar proof casingv enclosing the locking means and acting to retard unauthorized access to the locking means.

' 7. In a device of the class described, the

combination of a burglar retarding casing,

circuit afl'ecting means contained therein, an induction coll secured to the casing and operatively connected to the circuit affecting means, means constituting an interior portion of the coil for securing the same to the casing, theouter portion of the coil constituting a barrier surrounding the operative parts of the coil and acting to retard unauthorized attempts to gain access to said securing means through the coil and said coil and its securing means being protected by thecasing at one end whereby the coil cannot be removed intact from the casing.

' 8. In an induction coil unit. the combination of an induction coil, a theft retarding safe, means solely accessiblefrom the interior of the safe for securing the coil to the safe, said means constituting the internal core of the coil whereby unauthorized detachment of coil from the safe by mutilation of the coil will cause it to become inoperatlve. I

, 9. In an induction coil unit, the combination of an induction coil, a theft retarding safe enclosing one end of the coil and permitting the other end to be exposed. means solely accessible from the interior of the safe for securing the coil to the safe, said means constituting a necessary structural part of the interior of the coil whereby unauthorized detachment of coil from the safe by one end of the coil and said means being metallic and constituting a portion ofthe magnetic circuit continuous with one end of the core. I

11. An induction coil having end walls, a centrally positioned core bolt having one end contained in one of said end walls and the other end projecting through the other end wall, conductors leading through both of the end walls, certain of said conductors being included in the circuit containing the primary windings of the coil. a circuit affecting instrumentality operatively connected to certainother of said conductors and certain others of said conductors ,being independent of the primary windings.

12. An induction coil having primary windings and a core constituting a means for "maven-r9 v 5 mounting the 'coil in place and positioned 18. induction coil includinga metallic centrally in the core winding,- two pairs of core provided -with a bore and a flexible con- ,10

conductors, each pair leading to the primary ductor positioned in said bore.- 7 windings, circuit afiecting means operatively Signed at New York city inthe county of 5 connected to one pair of the conductors and New York and State of New York' this 7th the other pair of the conductors constituting day of October, A. D. 192] p 7 part of the circuit including the primary v 4 windings and said circuit affecting means. HOWARD J MURRAY. 

